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Acoustic Regular Location: Hong Kong Registered: November 2003	Re: 20V extractor for sprinter? Fri, 03 June 2005 17:28 Hi Sam Thanks for your interest, and sorry that my chart is confusing. 1st the easy bits, I've got a single flexible when it goes into the final now. However due to the length or distance the flexible knocks my chassis some times - if you've got more $$$ perhaps you can make a twin flexible at the secondaries itself ??? but I suppose most people would not agree, so do I I didn't have any vibrations before the installation of flexible. Lucky me I guess. Except my muffler always fall off from the bracket, because too much stress I suppose. The rubber also always fall off After using the flexible and ADD one more bracket at the neck above the axle and tighter rubbers it's all fine now. Now to answer the more complicated question. 500 mm primaries should mate with 250 mm secondaries, which both must be 1.5" diameter. They are optimised for 10,200 rpm. The starting power comes one octave below which is 5,100 rpm. And an even lighter feeling of power output comes another octave below at 2,550 rpm. Has these been what you've got ??? power starts to come at 5k rpm ??? You have not made your secondaries right? and you plan to use 2" instead of 1.5". This will complicate matters. With 2" you'll need longer length to "be equal" of "the half of the primary" However if you follow 250 mm, then it's frequency = rpm will be lower hence you gain some low-end. There is a concern of flywheel weight / total crank rotational weight. When I had a 5.8kg flywheel with a 0.85kg crank pulley - power starts to come 1,700 rpm and it kicks at 2,500 and becomes stagering at 4,000 to 6,000 because my sweet spot is 5,200 rpm. It still goes smooth and powerfull all the way to 8k. After I change the flywheel to 5.2kg and change of a slightly larger muffler 2" in 2" out slightly larger volume box, my low end suffered a little. Power starts 2,500 instead of 1,700 and power it kicks at 3,500 and stagering at the usual 4,000 and onwards. I've also got a race muffler stand-by for swap (straight flow) 3" in 3" out and sucks completely at low end below 4,000 on light and partial throttle. This muffler is meant for race and must be used with lots of full throttle. So, when full throttle is applied, power comes stagering from around 2,500 rpm - may be lower. The rev goes up very very fast... My silvertop RWD considering more drive train loss can maintain position against ford 1.8 dohc ff. Hope this helps. [Report message to a moderator]

	Subject	Poster	Date
	20V extractor for sprinter?	JNR 13B	Tue, 31 May 2005 13:09
	Re: 20V extractor for sprinter?	Simon-AE86	Tue, 31 May 2005 13:17
	Re: 20V extractor for sprinter?	Simon-AE86	Tue, 31 May 2005 13:26
	Re: 20V extractor for sprinter?	JNR 13B	Tue, 31 May 2005 20:10
	Re: 20V extractor for sprinter?	cannonball	Wed, 01 June 2005 00:09
	Re: 20V extractor for sprinter?	JNR 13B	Wed, 01 June 2005 02:53
	Re: 20V extractor for sprinter?	Corona RT142	Wed, 01 June 2005 02:58
	Re: 20V extractor for sprinter?	JNR 13B	Wed, 01 June 2005 08:58
	Re: 20V extractor for sprinter?	Sam_Q	Thu, 02 June 2005 09:27
	Re: 20V extractor for sprinter?	JNR 13B	Thu, 02 June 2005 09:44
	Re: 20V extractor for sprinter?	Sam_Q	Thu, 02 June 2005 09:57
	Re: 20V extractor for sprinter?	Acoustic	Fri, 03 June 2005 09:19
	Re: 20V extractor for sprinter?	nightdevil	Fri, 03 June 2005 12:08
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 14:28
	Re: 20V extractor for sprinter?	monkeymajik	Fri, 03 June 2005 14:59
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 15:10
	Re: 20V extractor for sprinter?	Acoustic	Fri, 03 June 2005 17:28
	Re: 20V extractor for sprinter?	monkeymajik	Sat, 04 June 2005 00:46
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 22:32
	Re: 20V extractor for sprinter?	jkvsnn	Fri, 03 June 2005 23:17
	Re: 20V extractor for sprinter?	Sam_Q	Sat, 04 June 2005 01:34
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 02:26
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 04 June 2005 08:45
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 10:48
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 10:50
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 04 June 2005 12:44
	Re: 20V extractor for sprinter?	toyotakia	Sat, 04 June 2005 23:55
	Re: 20V extractor for sprinter?	TauhuTauhu	Sun, 05 June 2005 13:33
	Re: 20V extractor for sprinter?	Sam_Q	Wed, 08 June 2005 09:18
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 11 June 2005 20:42
	Re: 20V extractor for sprinter?	Steve-AE86	Sun, 12 June 2005 08:28
	Re: 20V extractor for sprinter?	shinybluesteel	Sun, 12 June 2005 08:36
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 09:40
	Re: 20V extractor for sprinter?	Steve-AE86	Sun, 12 June 2005 10:26
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 09:41
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 10:31
	Re: 20V extractor for sprinter?	Sam_Q	Mon, 13 June 2005 03:28
	Re: 20V extractor for sprinter?	shinybluesteel	Mon, 13 June 2005 03:39
	Re: 20V extractor for sprinter?	Sam_Q	Mon, 13 June 2005 03:50
	Re: 20V extractor for sprinter?	irishtwincam	Tue, 21 June 2005 10:58
	kk	shinybluesteel	Tue, 21 June 2005 11:27
	Re: 20V extractor for sprinter?	Sam_Q	Wed, 13 July 2005 02:36

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